<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>019-变量.html</title>
	<style>
		
	</style>
</head>
<body>
	
</body>
<script>
	// var a =1;
	// console.log(a);
	var a;
	// console.log(a);
	a=2;
	console.log(":::1",a);
	a=true;
	console.log(":::2",a);
	a="kuazhu";
	console.log(":::",a);
</script>
</html>